Description: The design of a traffic signal control circuits. Requirements: 1, main roads and branch roads alternately release, the main road each release of 30 seconds, the branch roads each release of 20 seconds. 2, each time the green light change when the red light, yellow light on for 5 seconds, then the original red light unchanged. Three decimal digits (counting) shows the release and waiting time.
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Traffic lights program.doc
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